Run `pod install` after upgrade

[thymikee]

Describe the Feature

upgrade command could use installPods helper, and run:

pod repo update
pod install

after installing JS deps.

Here's how init uses it:

cli/packages/cli/src/commands/init/init.js

Lines 164 to 166 in a3d468e

	if (process.platform === 'darwin') {
	await installPods({projectName, loader});
	}

It's likely that installPods will need another option introduced to decide whether update the pods or not. It's not necessary during init because all pods are local, but it's usually necessary when having 3rd party libraries. We can also be smart about it and check for presence of 3rd party RN libs by accessing config.dependencies.

cc @orta @fson what do you think?

[orta]

I think that's reasonable, yep 👍

[simka]

I'd like to work on this issue, if nobody works on it yet

[thymikee]

Sure, take it 👍 However, I'd only run it after the upgrade was successful. Otherwise just log to the console something like 'hey, don't forget to run "pod install" once your done upgrading manually'.